[CA] [CA11] SeaTalkNG to NMEA2000 Connection

[Hank496]

We have a 2009 Sabre with twin Volvo D6-IPS450 engine drives that is new to us this year. The purpose of this post is to gain understanding of the existing 2009 vintage Raymarine system to determine whether a partial upgrade, or remove all and replace all with new is in order. It has an entire Raymarine redundant suite of navigation MFD/GPS/AIS transciever/HD Radar/S3G autopilot/DSM30 depth. The specifics are not necessary for the purpose of this post's question. And in keeping with the one question one post policy explained to me in response to previous requests I am trying to minimize the repeating of irrelevant information.

A NMEA2000 network was created for boat data display (Volvo MFD display) via appropriate Volvo NMEA2000 gateways and to interface with the autopilot. This work was conducted by Sabre.

The rest of the Raymarine suite was installed by a local Raymarine dealer in 2011 when the boat was commissioned by the first owner. The RM suite has most of the proprietary RM networks (SeaTalk, SeaTalk2, SeaTalkHS, and SeaTalkNG). This question relates to the connection of the SeaTalkNG network to the boat's NMEA2000. STNG consists of a STNG converter E22158 that converts GPS data from the RS125, and connects AIS650, the two MFDs, and to the NMEA2000 network.

The connection between NMEA2000 and STNG is done with a blue/white backbone cable that has a devicenet connector spliced on the NMEA2000 end. As part of the upgrade I want to replace this with the appropriate cable and adaptor. Both networks have their own power connections and I have been told that NMEA2000 networks should only have one power connection. Considering the original interface cable was customized (power not passed through?), will I need to disconnect one of the power supplies (NMEA or STNG?) if the original cable is replaced with adapter / cable?